:root {
  /* base */
  --color-void:        #050505;
  --color-void-raised: #0f0f0f;
  --color-silver:      #ededea;
  --color-silver-dim:  #8a8a86;
  --color-line:        #2a2a28;

  /* single accent — used almost nowhere */
  --color-accent:      #b8860b;

  /* vellum overlay — reproduces the printed book's translucent text leaf */
  --color-vellum:      rgba(237, 234, 226, 0.3);
  --color-vellum-ink:  #2a2a28;

  /* series/viewer pages — fine-art paper stock (cool neutral gray, matches B&W prints), not the void */
  --color-paper:        #e7e7e5;
  --color-paper-ink:     #262625;
  --color-paper-ink-dim: #7c7c78;

  --color-visited:     #57574f;
  --color-focus-ring:  #ededea;

  /* type */
  --font-caption: "Inter", "Suisse Int'l", -apple-system, "Segoe UI", sans-serif;
  --font-body:    "PT Serif", "Source Serif", Georgia, serif;
  --tracking-caption: 0.1em;
  --measure: 64ch;
  --leading-body: 1.6;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--color-void);
  color: var(--color-silver);
  font-family: var(--font-caption);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 1px solid var(--color-focus-ring);
  outline-offset: 4px;
}

/* title page = series index */

.series-index {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(1rem, 3vw, 2rem);
  padding: 4rem 1.5rem 6rem;
}

.series-index__status {
  color: var(--color-silver-dim);
  letter-spacing: var(--tracking-caption);
  text-transform: uppercase;
  font-size: 0.8rem;
}

.series-index__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 0.5rem 0;
}

.series-index__title {
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  letter-spacing: var(--tracking-caption);
  text-transform: uppercase;
  text-align: center;
  color: var(--color-silver);
  opacity: 0.8;
  transition: opacity 400ms ease;
}

.series-index__item:hover .series-index__title,
.series-index__item:focus-visible .series-index__title {
  opacity: 1;
}

.series-index__year {
  font-size: 0.75rem;
  letter-spacing: var(--tracking-caption);
  color: var(--color-silver-dim);
}

/* persistent copyright — the only chrome on the site */

.site-footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  text-align: center;
  padding: 1rem 0;
  font-size: 0.7rem;
  letter-spacing: var(--tracking-caption);
  text-transform: uppercase;
  color: var(--color-silver-dim);
  background: linear-gradient(to top, var(--color-void) 60%, transparent);
}

/* "book" series only (spec §3.1) — paper stage instead of the void.
   Applied by viewer.js as a modifier class, never on by default. */

body.viewer-page--book {
  background: var(--color-paper);
  color: var(--color-paper-ink);
}

.viewer-page--book .viewer__status {
  color: var(--color-paper-ink-dim);
}

.viewer-page--book .viewer__title-card {
  color: var(--color-paper-ink);
}

.viewer-page--book .site-footer {
  color: var(--color-paper-ink-dim);
  background: linear-gradient(to top, var(--color-paper) 60%, transparent);
}

.viewer-page--book a:focus-visible,
.viewer-page--book button:focus-visible {
  outline-color: var(--color-paper-ink);
}

.viewer {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 1.5rem 6rem;
}

/* close + prev/next — thin quiet glyphs, no circles/shadows/backgrounds */

.viewer__close {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 10;
  padding: 1.25rem 1.5rem;
  font-family: var(--font-caption);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--color-silver-dim);
  opacity: 0.7;
  transition: opacity 400ms ease;
}

.viewer__close:hover,
.viewer__close:focus-visible {
  opacity: 1;
}

.viewer-page--book .viewer__close {
  color: var(--color-paper-ink-dim);
}

.viewer__nav {
  position: fixed;
  top: 4.5rem;
  bottom: 0;
  z-index: 10;
  display: none;
  align-items: center;
  width: 4rem;
  border: none;
  background: none;
  font-family: var(--font-caption);
  font-size: 1.75rem;
  line-height: 1;
  color: var(--color-silver-dim);
  opacity: 0.6;
  cursor: pointer;
  transition: opacity 400ms ease;
}

.viewer__nav:hover,
.viewer__nav:focus-visible {
  opacity: 1;
}

.viewer-page--book .viewer__nav {
  color: var(--color-paper-ink-dim);
}

.viewer__nav--prev {
  left: 0;
  justify-content: flex-start;
  padding-left: 1.25rem;
}

.viewer__nav--next {
  right: 0;
  justify-content: flex-end;
  padding-right: 1.25rem;
}

/* prev/next are for precise pointers only — touch devices use swipe */
@media (hover: hover) and (pointer: fine) {
  .viewer__nav {
    display: flex;
  }
}

.viewer__status {
  color: var(--color-silver-dim);
  letter-spacing: var(--tracking-caption);
  text-transform: uppercase;
  font-size: 0.8rem;
}

.viewer__frame {
  position: relative;
  display: inline-block;
  margin: 0; /* reset the UA default <figure> margin — it was eating into
                the flex container's available space and shrinking the
                frame below the size js/viewer.js computes for it */
  max-width: 92vw;
  max-height: 82vh;
  cursor: pointer;
  line-height: 0;
  /* width/height are set inline per photo (js/viewer.js) as exact pixels —
     this is what reserves the correct box before the photo has loaded.
     Doing it on the figure rather than the <img> avoids a sizing deadlock:
     a block-level replaced element with auto width/height inside a
     shrink-to-fit inline-block parent can't resolve a size until it has
     loaded, since neither the image nor its wrapper has a definite width
     to start from. */
}

.viewer__image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  animation: viewer-surface 700ms ease-in-out forwards;
}

@keyframes viewer-surface {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.viewer__vellum {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
  background: var(--color-vellum);
  opacity: 0;
  transition: opacity 700ms ease-in-out;
  pointer-events: none;
}

.viewer__vellum.is-visible {
  opacity: 1;
}

.viewer__vellum p {
  margin: 0 0 0.75em;
  color: var(--color-vellum-ink);
  font-family: var(--font-body);
  font-size: clamp(0.65rem, 1vw, 0.75rem);
  line-height: var(--leading-body);
  max-width: 32ch;
}

.viewer__vellum p:last-child {
  margin-bottom: 0;
}

.viewer__title-card {
  max-width: var(--measure);
  padding: 0 1.5rem;
  text-align: center;
  color: var(--color-silver);
  font-family: var(--font-body);
  font-size: clamp(1.1rem, 3vw, 1.6rem);
  opacity: 0;
  animation: viewer-surface 700ms ease-in-out forwards;
}